EPX-2R is a high-performance plastic explosive produced for different applications. EPX-2R is based on RDX (1,3,5-trinitro-1,3,5-triazinane) bonded by the elastic matrix of the softened styrene butadiene binder. A computerizing mixer plastograph was used for the production of EPX-2R. The internal energy of combustion was measured and used to determine the enthalpy of formation. Friction and impact sensitivities were measured. The velocity of detonation was determined experimentally, and the detonation properties were calculated by the EXPLO 5 code. For comparison, traditional plastic explosives, composition C-4, Semtex 10, Formex P1, EPX-1, and Sprängdeg m/46, were studied. It was concluded that the velocity of detonation of EPX-2R was higher than the studied samples except composition C-4, while its sensitivity is the lowest. Interesting inversely proportional relationship between the measured internal energy of combustion and the calculated heat of detonation was observed.

<p class="abstract"><strong>Background:</strong> The objective of the study was to avoid nasal polyposis occurrence after recurrent FEES.</p><p class="abstract"><strong>Methods:</strong> 87 patients undergoing recurrent FESS due to recurrent nasal polyposis, after completing all steps of FESS the placement of normal nasal mucosa from inferior turbinate or nasal septum instead of the mucosa of the fovea ethmoidalis and lamina papyracea was done.  </p><p class="abstract"><strong>Results:</strong> There were nasal obstruction improvement in 79 patients (90.8%), but there were 8 patients (9.2%) had recurrent nasal polypi causing nasal obstruction. There was smell improvement in 38 patients (71.7%) out of 15 patients (28.3%).</p><p class="abstract"><strong>Conclusions:</strong> The nasal cavity grafting in FESS of recurrent nasal polyposis with nasal septal or inferior turbinate mucosa had promising results in prevention of nasal polyposis recurrence. These results made a recommendation of nasal cavity grafting during primary FESS of nasal polyposis.</p>